Melbelle1820,
You're lighting should be fine for a Derasa.
I do suggest that you add a refugium for some additional biological filtration. Especially with your fishload. Scheduled carbon use is good, but the algae in a refugium will pull out a lot of what carbon can't. Some other benefits are, added water volume, haven for critter population, PH stability when reverse photoperiod is applied.
I ditched skimmers in '92 and never looked back, but still replaced it with a natural alternative. Relying on your live rock and live sand will not be enough in the long run.